题目

阅读理解We all experience ohcrap moments. Running into the person you canceled a date with — whileyou're on another date. Realizing you hit reply allon an e-mailthat you'd do anything to have back. Whatever the situation, the first thingyou probably do is freak out. Everybody does. While many of us think thatwe're cool in a crisis, science tells us that we seldom are. At the moment weneed to be keenly aware of our surroundings, our attention can tunnel in on thescariest thing in the scene, leaving us unaware of the other sights, sounds,and even smells around us. Armed robbers go unidenti假说—演绎法是现代科学研究中常用的一种科学方法。下列属于孟德尔在发现基因自由组合定律时的“演绎”过程的是( 　)。 A.生物的性状是由遗传因子决定的 B.由F2出现了“3∶1”推测生物体产生配子时,成对遗传因子彼此分离 C.若F1产生配子时成对的遗传因子分离,非成对的遗传因子自由组合,则测交后代会出现四种表现型,其比例接近1∶1∶1∶1 D.若F1产生配子时成对的遗传因子分离,则F2中三种基因型个体比例接近1∶2∶1